Automatic stop for moving-picture machines



J. B. KUHN.

AUTOMATIC STOP FOR MOVING PICTURE MACHINES. APPUCATlON FILED AUG.8 1921.

Patentei July 25, 19.22

L SUCETS-SHEET Arroawns J. B..KUHN.

AUTOMATIC STOP FOR MOVING PICTURE MACHINES, APPLICATION FILED AUG.8. I921.

Patented J 1113' 25, 1922 Z SHEETS-SHEET 2.

ACIVENTOR A ITORNEVS' unrrsn STATES .PATENT'OFFICE.

1 JAMES BERNARD KUHN, F CAMERON, WEST VIRGINIA.

Specification of Letters Patent.

Patented July 25,- 1922.

Application filed August 8, 1921. Serial No. 490,620.

To all whom it may concern Be it known that l, JAMns BERNARD KUHN, a citizen of the United States, and resident of Cameron, in the county of Marshall and State of West Virginia, have invented certain new and useful Improvements in Automatic Stops for lVlo-ving-licture Machines, of which the following is a specification.

This invention relates to automatic stops for moving picture machines.

An important object ofthis invention is to provide an automatic stop for moving icture machines having novel means where by the machine is stopped when the film fails to feed by the feed sprockets whereby the film is prevented from being entirely broken.

An automatic stop constructed in accordance with this invention will greatly reduce the-fire hazards in that the machine is stopped before the film can possibly catch fire.-

A further object is to provide an automatic stop for moving picture machines which is positive and reliable in operation and which may be applied to a motion picture machine without elaborately altering the construction of the same.

In the accompanying drawing forming a part of this application in which like numerals are employed to designate like parts throughout the same,

Figure l is a perspective of the invention in use.

Figure 2 is a plan view of the improved automatic stop.

Figure 3 is a side elevation of the same.

Figure 1 is an end elevation ofthe same.

Figuref; is a fragmentary perspective of a clutch embodied in the invention.

Figure (3 is a perspective of an operating arm embodied in'the invention.

.In the drawing the numeral generally designates a power transmitting; attachment for motion picture machines, the said power transmitting attachment being adapted for transmitting the power from a suitable motor to a means for feeding the film through the machine in the usual manner. The power transmitting attachment comprises a base 11 having a pair of bearings 12 which rotatably receive a shaft 13 upon which is keyed or otherwise secured a power transmitting pulley 16. The power transmitting pulley is operated from a suitable source of power such as an electric 'motor by means of a continuous belt 17 trained about the pulley illustrated in Figure 1. \Yhen the pulley 16 is operated the shaft 13 is rotated thus imparting a rotary motion to a counter shaft 18 rotatably supported by bearings 18) formed integral with the base. A driving connection is established between the counter shaft 18 and the shaft 13 by means of a gear 20 rotatable on the shaft 13 and a larger gear 21 keyed or otherwise secured to the shaft 18.

While the gear 20 is rotatable on the shaft 12 the same is securely connected to the shaft by means of a clutch consisting of a pair of coacting sections :24 and 25, the section 21 being connected to the gear 20 while the section 25 is slidably and non-rotatably mounted on the shaft 13.

The section 25 of the clutch is provided with a sleeve 26 having a pair of oppositely arranged longitudinally extending slots 27 which slidably receive oppositely arranged pins or studs 28 extended from the shaft 13. ll'ith reference to Figure 5 it will be noted that the pins 28 have engagement with the, 1

side walls of the slots 27 and thereby hold the said section 25 against rotation with relation to the shaft 13. a

By reason of this construction the engagement of the section 25 with the section 24 locks the gear 20 to the shaft 13 to cause the shaft is to rotate when the shaft 13 is rotated. A driving connection is established between the sections 24c and 25 by means of lugs 28' received within sockets or recesses 30 in the section 21. With reference to Figure 2 it will be observed that the section 25 is urged into driving engagement with the section 24 by means of a coiled spring 31 confined between one of the bearings l2 and the adjacent end of the sleeve 26.

A second gear 33 is kevcd or otherwise.

rigidly secured to the shaft 13 and is. adapted to drive a inain drive wheel 34 forming a part of the motion picture machine.

ll'ith reference to the foregoing it will. be observed that the rotation of the pulley 16 will rotate the shaft 13 and consequently theshaft 18. When the shaft- 18 is rotated the gear 33 of course will be rotated for operating the gear 31 whereupon the motion picture machine will be operated. known the operation of the gear 34 results in feeding the film through the machine and over a series of feed sprockets one of which is located at the "lower portion of the wa As is well incense "161 ieing located at the The hell-cmnk 4:) is provided with a secneehine, ond branch 49 which is engaged with an arm 50 of an operating lever generally designated hy the numeral 51. The operating lever 51 is pivoted intermediate its ends to 1 below the plane of the base 10 as indicated at 52 and is provided 0. I 7 per portion oi the film at one end with a laterally projecting roller pauses over th zonal feed sprocket on or Contact arm 53 which is engaged, by the s inner, looped portion of the film 37. The roller 6 the film is looped member 53 is rotatable on a pin 54 carried loop is by the lever 51 and when the tension on the film 37 is increased the roller 53 is elevated moving the arm 50 downwardly. The tension on the film lSlIlCI'BZlSQll because of the failure 01. the film to feed by the feed sprockets when the latter are rotated. When the film ceases to feed the roller 53 is elevated and the arm 50 is lowered for swinging the bell crank on its pivot and therebv moving the operating ai m. 39 longiit yetudina lly. e m 4 3% In operation the attachment is attached ight as illustrated in Figure. l and when av mutilated portion of the film passes the feed sli m sprockets the film of course will cease to l'iingigml feed and thereby take up the loop with which the roller 53 is engaged. Therefore, the roller or contact member 53 is elevated end the arm 50 is moved downwardly for moving the arm 39 longitudinally and theree h breaking the driving connection between The machine is i silly stopped tlie clutch sections 24 and 25. when the ii 11 toils to L'Qid by longitut' When the driving connection between the nally move. clutch operating arm 39 clutch sections 24 and 25 is broken the ma slldchly csrr "liaise and havin a chine is quickly stopped though the motor lnter' l' lg lien; d0 extended into an continues to operate undthe stoppageof the Y in the scc'i n 25. machine prevents the film from catching on ally movable clutch arm 39 fir itg; mgvemm'gt by means of a The driving OOIIIIGCtiOH will remain broken led the no and slidgble until the film is repaired and the attach- 108 n lnsl in the arm. ment as ain set for o ration.

' will he noted As ll nstrated in *igure 1 the arm 50 of of the longitudh the lever 51 is offset as indicated at 55 so mm 23.9 is li ited as to dis the terminal of the arm 50 kt fith the the terminal of the brzinch 49'. Also the 110 omi 39 terminal portion of the branch or arm 50 cl'renk germ is curved longitudinally and engages the said upper edge of the branch 49. By curving ii the terminal portion of the bra All; 530 a =1" pivotal shoulder is formed at one side of the branch 11.!

the 49 so as to limit the lateral movement of the zrovided bell crank in case the pivotal support of .ill'l holes the same becomes loose. 'fi l 1m; Having thus described my invention what I claim is: i 1

1. An automatic stop for motion picture machines comprising a shaft, a clutch section mounted thereon, a longitudinally movable arm having a fork engaging said clutch tio lJ-GLWGEH the, "section, a' bell crank enga ed with said arm 1" i broken. and a film en aging mom 1' dctachably cngaged with said crank andnda ted to swing the same on its pivot when he tension on the film exceeds a predetermined point.

. 2. An automatic stop for motion picture 1 machines comprising a shaft, a pair of coacting clutch sections mounted on said shaft, a longitudinally movable operating arm having a forked portion engaging one of said clutch sections, a bell crank engaging said longitudinally movable arm, a lever having one end portion engaged with said bell crank, and a film engaging member carried by said lever,

tension on the film increases to a predetermined point whereby to move said arm longitudinally and disengage said clutch sections.

3. An automatic stop for motion picture and adapted to be operated when the.

machines comprising a shaft, a pair of coacting clutch sections mounted on said shaft, a longitudinally movable operating arm engaging one of said clutch sections, a bell crank engaging said longitudinally mov able arm, a lever having one end portion engaged with said bell crank, and a film en gaging member carried by said lever, and adapted to be operated when the tension on the film exceeds a predetermined point whereby to move said argii longitudinally and disengage said clutch sections and means to limit the longitudinal movement of said arm.

JAMES BERNARD KUHN, 

